Annotation:
A method for optimizing the frequency of precautionary replacements
of railway automation and remote control equipment based on the economic
criterion – the minimum of specifi c operating costs – and the reliability criterion –
the permissible value of the failure rate, is presented. The depth of restoration of
reliability after repair of equipment is proposed to be estimated as the difference
between the pre-repair and overhaul life.
Possible strategies and corresponding mathematical models for optimizing
the technical content of the equipment are considered based on the criterion of
the minimum specifi c operating costs. The method of obtaining cost indicators
and distribution of the operating time of the equipment for failure is described.
Expressions are given for determining the values of the frequency of precautionary
substitutions by economic and reliability criteria.
As a result of the research, curves of the dependences of the optimal values
of the periodicity of substitutions on the cost were obtained for different values of
the depth of restoration of the equipment reliability. A boundary curve is presented
for the dependence of the cost of replacing the repaired and new equipment on the
depth of restoration of reliability.
It is established that the task of determining the periodicity of precautionary
changes in the equipment of railway automation and remote control according to
the criterion of the minimum specifi c operating costs and by the criterion of the
permissible value of the failure rate is solved analytically.
Key words:
replacement, repair, periodicity, unit costs, optimization, failure rate